1 /* 2 * linux/fs/9p/vfs_inode.c 3 * 4 * This file contains vfs inode ops for the 9P2000 protocol. 5 * 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/file.h> 32 #include <linux/pagemap.h> 33 #include <linux/stat.h> 34 #include <linux/string.h> 35 #include <linux/inet.h> 36 #include <linux/namei.h> 37 #include <linux/idr.h> 38 #include <linux/sched.h> 39 #include <linux/slab.h> 40 #include <linux/xattr.h> 41 #include <linux/posix_acl.h> 42 #include <net/9p/9p.h> 43 #include <net/9p/client.h> 44 45 #include "v9fs.h" 46 #include "v9fs_vfs.h" 47 #include "fid.h" 48 #include "cache.h" 49 #include "xattr.h" 50 #include "acl.h" 51 52 static const struct inode_operations v9fs_dir_inode_operations; 53 static const struct inode_operations v9fs_dir_inode_operations_dotu; 54 static const struct inode_operations v9fs_file_inode_operations; 55 static const struct inode_operations v9fs_symlink_inode_operations; 56 57 /** 58 * unixmode2p9mode - convert unix mode bits to plan 9 59 * @v9ses: v9fs session information 60 * @mode: mode to convert 61 * 62 */ 63 64 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 65 { 66 int res; 67 res = mode & 0777; 68 if (S_ISDIR(mode)) 69 res |= P9_DMDIR; 70 if (v9fs_proto_dotu(v9ses)) { 71 if (v9ses->nodev == 0) { 72 if (S_ISSOCK(mode)) 73 res |= P9_DMSOCKET; 74 if (S_ISFIFO(mode)) 75 res |= P9_DMNAMEDPIPE; 76 if (S_ISBLK(mode)) 77 res |= P9_DMDEVICE; 78 if (S_ISCHR(mode)) 79 res |= P9_DMDEVICE; 80 } 81 82 if ((mode & S_ISUID) == S_ISUID) 83 res |= P9_DMSETUID; 84 if ((mode & S_ISGID) == S_ISGID) 85 res |= P9_DMSETGID; 86 if ((mode & S_ISVTX) == S_ISVTX) 87 res |= P9_DMSETVTX; 88 } 89 return res; 90 } 91 92 /** 93 * p9mode2perm- convert plan9 mode bits to unix permission bits 94 * @v9ses: v9fs session information 95 * @stat: p9_wstat from which mode need to be derived 96 * 97 */ 98 static int p9mode2perm(struct v9fs_session_info *v9ses, 99 struct p9_wstat *stat) 100 { 101 int res; 102 int mode = stat->mode; 103 104 res = mode & S_IALLUGO; 105 if (v9fs_proto_dotu(v9ses)) { 106 if ((mode & P9_DMSETUID) == P9_DMSETUID) 107 res |= S_ISUID; 108 109 if ((mode & P9_DMSETGID) == P9_DMSETGID) 110 res |= S_ISGID; 111 112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 113 res |= S_ISVTX; 114 } 115 return res; 116 } 117 118 /** 119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 120 * @v9ses: v9fs session information 121 * @stat: p9_wstat from which mode need to be derived 122 * @rdev: major number, minor number in case of device files. 123 * 124 */ 125 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 126 struct p9_wstat *stat, dev_t *rdev) 127 { 128 int res; 129 u32 mode = stat->mode; 130 131 *rdev = 0; 132 res = p9mode2perm(v9ses, stat); 133 134 if ((mode & P9_DMDIR) == P9_DMDIR) 135 res |= S_IFDIR; 136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 137 res |= S_IFLNK; 138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 139 && (v9ses->nodev == 0)) 140 res |= S_IFSOCK; 141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 142 && (v9ses->nodev == 0)) 143 res |= S_IFIFO; 144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 145 && (v9ses->nodev == 0)) { 146 char type = 0, ext[32]; 147 int major = -1, minor = -1; 148 149 strlcpy(ext, stat->extension, sizeof(ext)); 150 sscanf(ext, "%c %u %u", &type, &major, &minor); 151 switch (type) { 152 case 'c': 153 res |= S_IFCHR; 154 break; 155 case 'b': 156 res |= S_IFBLK; 157 break; 158 default: 159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 160 type, stat->extension); 161 }; 162 *rdev = MKDEV(major, minor); 163 } else 164 res |= S_IFREG; 165 166 return res; 167 } 168 169 /** 170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 171 * @uflags: flags to convert 172 * @extended: if .u extensions are active 173 */ 174 175 int v9fs_uflags2omode(int uflags, int extended) 176 { 177 int ret; 178 179 ret = 0; 180 switch (uflags&3) { 181 default: 182 case O_RDONLY: 183 ret = P9_OREAD; 184 break; 185 186 case O_WRONLY: 187 ret = P9_OWRITE; 188 break; 189 190 case O_RDWR: 191 ret = P9_ORDWR; 192 break; 193 } 194 195 if (extended) { 196 if (uflags & O_EXCL) 197 ret |= P9_OEXCL; 198 199 if (uflags & O_APPEND) 200 ret |= P9_OAPPEND; 201 } 202 203 return ret; 204 } 205 206 /** 207 * v9fs_blank_wstat - helper function to setup a 9P stat structure 208 * @wstat: structure to initialize 209 * 210 */ 211 212 void 213 v9fs_blank_wstat(struct p9_wstat *wstat) 214 { 215 wstat->type = ~0; 216 wstat->dev = ~0; 217 wstat->qid.type = ~0; 218 wstat->qid.version = ~0; 219 *((long long *)&wstat->qid.path) = ~0; 220 wstat->mode = ~0; 221 wstat->atime = ~0; 222 wstat->mtime = ~0; 223 wstat->length = ~0; 224 wstat->name = NULL; 225 wstat->uid = NULL; 226 wstat->gid = NULL; 227 wstat->muid = NULL; 228 wstat->n_uid = INVALID_UID; 229 wstat->n_gid = INVALID_GID; 230 wstat->n_muid = INVALID_UID; 231 wstat->extension = NULL; 232 } 233 234 /** 235 * v9fs_alloc_inode - helper function to allocate an inode 236 * 237 */ 238 struct inode *v9fs_alloc_inode(struct super_block *sb) 239 { 240 struct v9fs_inode *v9inode; 241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 242 GFP_KERNEL); 243 if (!v9inode) 244 return NULL; 245 #ifdef CONFIG_9P_FSCACHE 246 v9inode->fscache = NULL; 247 spin_lock_init(&v9inode->fscache_lock); 248 #endif 249 v9inode->writeback_fid = NULL; 250 v9inode->cache_validity = 0; 251 mutex_init(&v9inode->v_mutex); 252 return &v9inode->vfs_inode; 253 } 254 255 /** 256 * v9fs_destroy_inode - destroy an inode 257 * 258 */ 259 260 static void v9fs_i_callback(struct rcu_head *head) 261 { 262 struct inode *inode = container_of(head, struct inode, i_rcu); 263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 264 } 265 266 void v9fs_destroy_inode(struct inode *inode) 267 { 268 call_rcu(&inode->i_rcu, v9fs_i_callback); 269 } 270 271 int v9fs_init_inode(struct v9fs_session_info *v9ses, 272 struct inode *inode, umode_t mode, dev_t rdev) 273 { 274 int err = 0; 275 276 inode_init_owner(inode, NULL, mode); 277 inode->i_blocks = 0; 278 inode->i_rdev = rdev; 279 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 280 inode->i_mapping->a_ops = &v9fs_addr_operations; 281 282 switch (mode & S_IFMT) { 283 case S_IFIFO: 284 case S_IFBLK: 285 case S_IFCHR: 286 case S_IFSOCK: 287 if (v9fs_proto_dotl(v9ses)) { 288 inode->i_op = &v9fs_file_inode_operations_dotl; 289 } else if (v9fs_proto_dotu(v9ses)) { 290 inode->i_op = &v9fs_file_inode_operations; 291 } else { 292 p9_debug(P9_DEBUG_ERROR, 293 "special files without extended mode\n"); 294 err = -EINVAL; 295 goto error; 296 } 297 init_special_inode(inode, inode->i_mode, inode->i_rdev); 298 break; 299 case S_IFREG: 300 if (v9fs_proto_dotl(v9ses)) { 301 inode->i_op = &v9fs_file_inode_operations_dotl; 302 if (v9ses->cache) 303 inode->i_fop = 304 &v9fs_cached_file_operations_dotl; 305 else 306 inode->i_fop = &v9fs_file_operations_dotl; 307 } else { 308 inode->i_op = &v9fs_file_inode_operations; 309 if (v9ses->cache) 310 inode->i_fop = &v9fs_cached_file_operations; 311 else 312 inode->i_fop = &v9fs_file_operations; 313 } 314 315 break; 316 case S_IFLNK: 317 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 318 p9_debug(P9_DEBUG_ERROR, 319 "extended modes used with legacy protocol\n"); 320 err = -EINVAL; 321 goto error; 322 } 323 324 if (v9fs_proto_dotl(v9ses)) 325 inode->i_op = &v9fs_symlink_inode_operations_dotl; 326 else 327 inode->i_op = &v9fs_symlink_inode_operations; 328 329 break; 330 case S_IFDIR: 331 inc_nlink(inode); 332 if (v9fs_proto_dotl(v9ses)) 333 inode->i_op = &v9fs_dir_inode_operations_dotl; 334 else if (v9fs_proto_dotu(v9ses)) 335 inode->i_op = &v9fs_dir_inode_operations_dotu; 336 else 337 inode->i_op = &v9fs_dir_inode_operations; 338 339 if (v9fs_proto_dotl(v9ses)) 340 inode->i_fop = &v9fs_dir_operations_dotl; 341 else 342 inode->i_fop = &v9fs_dir_operations; 343 344 break; 345 default: 346 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 347 mode, mode & S_IFMT); 348 err = -EINVAL; 349 goto error; 350 } 351 error: 352 return err; 353 354 } 355 356 /** 357 * v9fs_get_inode - helper function to setup an inode 358 * @sb: superblock 359 * @mode: mode to setup inode with 360 * 361 */ 362 363 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 364 { 365 int err; 366 struct inode *inode; 367 struct v9fs_session_info *v9ses = sb->s_fs_info; 368 369 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 370 371 inode = new_inode(sb); 372 if (!inode) { 373 pr_warn("%s (%d): Problem allocating inode\n", 374 __func__, task_pid_nr(current)); 375 return ERR_PTR(-ENOMEM); 376 } 377 err = v9fs_init_inode(v9ses, inode, mode, rdev); 378 if (err) { 379 iput(inode); 380 return ERR_PTR(err); 381 } 382 return inode; 383 } 384 385 /* 386 static struct v9fs_fid* 387 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 388 { 389 int err; 390 int nfid; 391 struct v9fs_fid *ret; 392 struct v9fs_fcall *fcall; 393 394 nfid = v9fs_get_idpool(&v9ses->fidpool); 395 if (nfid < 0) { 396 eprintk(KERN_WARNING, "no free fids available\n"); 397 return ERR_PTR(-ENOSPC); 398 } 399 400 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 401 &fcall); 402 403 if (err < 0) { 404 if (fcall && fcall->id == RWALK) 405 goto clunk_fid; 406 407 PRINT_FCALL_ERROR("walk error", fcall); 408 v9fs_put_idpool(nfid, &v9ses->fidpool); 409 goto error; 410 } 411 412 kfree(fcall); 413 fcall = NULL; 414 ret = v9fs_fid_create(v9ses, nfid); 415 if (!ret) { 416 err = -ENOMEM; 417 goto clunk_fid; 418 } 419 420 err = v9fs_fid_insert(ret, dentry); 421 if (err < 0) { 422 v9fs_fid_destroy(ret); 423 goto clunk_fid; 424 } 425 426 return ret; 427 428 clunk_fid: 429 v9fs_t_clunk(v9ses, nfid); 430 431 error: 432 kfree(fcall); 433 return ERR_PTR(err); 434 } 435 */ 436 437 438 /** 439 * v9fs_clear_inode - release an inode 440 * @inode: inode to release 441 * 442 */ 443 void v9fs_evict_inode(struct inode *inode) 444 { 445 struct v9fs_inode *v9inode = V9FS_I(inode); 446 447 truncate_inode_pages(inode->i_mapping, 0); 448 clear_inode(inode); 449 filemap_fdatawrite(inode->i_mapping); 450 451 v9fs_cache_inode_put_cookie(inode); 452 /* clunk the fid stashed in writeback_fid */ 453 if (v9inode->writeback_fid) { 454 p9_client_clunk(v9inode->writeback_fid); 455 v9inode->writeback_fid = NULL; 456 } 457 } 458 459 static int v9fs_test_inode(struct inode *inode, void *data) 460 { 461 int umode; 462 dev_t rdev; 463 struct v9fs_inode *v9inode = V9FS_I(inode); 464 struct p9_wstat *st = (struct p9_wstat *)data; 465 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 466 467 umode = p9mode2unixmode(v9ses, st, &rdev); 468 /* don't match inode of different type */ 469 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 470 return 0; 471 472 /* compare qid details */ 473 if (memcmp(&v9inode->qid.version, 474 &st->qid.version, sizeof(v9inode->qid.version))) 475 return 0; 476 477 if (v9inode->qid.type != st->qid.type) 478 return 0; 479 return 1; 480 } 481 482 static int v9fs_test_new_inode(struct inode *inode, void *data) 483 { 484 return 0; 485 } 486 487 static int v9fs_set_inode(struct inode *inode, void *data) 488 { 489 struct v9fs_inode *v9inode = V9FS_I(inode); 490 struct p9_wstat *st = (struct p9_wstat *)data; 491 492 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 493 return 0; 494 } 495 496 static struct inode *v9fs_qid_iget(struct super_block *sb, 497 struct p9_qid *qid, 498 struct p9_wstat *st, 499 int new) 500 { 501 dev_t rdev; 502 int retval; 503 umode_t umode; 504 unsigned long i_ino; 505 struct inode *inode; 506 struct v9fs_session_info *v9ses = sb->s_fs_info; 507 int (*test)(struct inode *, void *); 508 509 if (new) 510 test = v9fs_test_new_inode; 511 else 512 test = v9fs_test_inode; 513 514 i_ino = v9fs_qid2ino(qid); 515 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 516 if (!inode) 517 return ERR_PTR(-ENOMEM); 518 if (!(inode->i_state & I_NEW)) 519 return inode; 520 /* 521 * initialize the inode with the stat info 522 * FIXME!! we may need support for stale inodes 523 * later. 524 */ 525 inode->i_ino = i_ino; 526 umode = p9mode2unixmode(v9ses, st, &rdev); 527 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 528 if (retval) 529 goto error; 530 531 v9fs_stat2inode(st, inode, sb); 532 v9fs_cache_inode_get_cookie(inode); 533 unlock_new_inode(inode); 534 return inode; 535 error: 536 unlock_new_inode(inode); 537 iput(inode); 538 return ERR_PTR(retval); 539 540 } 541 542 struct inode * 543 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 544 struct super_block *sb, int new) 545 { 546 struct p9_wstat *st; 547 struct inode *inode = NULL; 548 549 st = p9_client_stat(fid); 550 if (IS_ERR(st)) 551 return ERR_CAST(st); 552 553 inode = v9fs_qid_iget(sb, &st->qid, st, new); 554 p9stat_free(st); 555 kfree(st); 556 return inode; 557 } 558 559 /** 560 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 561 * plan 9 AT flag. 562 * @flags: flags to convert 563 */ 564 static int v9fs_at_to_dotl_flags(int flags) 565 { 566 int rflags = 0; 567 if (flags & AT_REMOVEDIR) 568 rflags |= P9_DOTL_AT_REMOVEDIR; 569 return rflags; 570 } 571 572 /** 573 * v9fs_remove - helper function to remove files and directories 574 * @dir: directory inode that is being deleted 575 * @dentry: dentry that is being deleted 576 * @rmdir: removing a directory 577 * 578 */ 579 580 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 581 { 582 struct inode *inode; 583 int retval = -EOPNOTSUPP; 584 struct p9_fid *v9fid, *dfid; 585 struct v9fs_session_info *v9ses; 586 587 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 588 dir, dentry, flags); 589 590 v9ses = v9fs_inode2v9ses(dir); 591 inode = dentry->d_inode; 592 dfid = v9fs_fid_lookup(dentry->d_parent); 593 if (IS_ERR(dfid)) { 594 retval = PTR_ERR(dfid); 595 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 596 return retval; 597 } 598 if (v9fs_proto_dotl(v9ses)) 599 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 600 v9fs_at_to_dotl_flags(flags)); 601 if (retval == -EOPNOTSUPP) { 602 /* Try the one based on path */ 603 v9fid = v9fs_fid_clone(dentry); 604 if (IS_ERR(v9fid)) 605 return PTR_ERR(v9fid); 606 retval = p9_client_remove(v9fid); 607 } 608 if (!retval) { 609 /* 610 * directories on unlink should have zero 611 * link count 612 */ 613 if (flags & AT_REMOVEDIR) { 614 clear_nlink(inode); 615 drop_nlink(dir); 616 } else 617 drop_nlink(inode); 618 619 v9fs_invalidate_inode_attr(inode); 620 v9fs_invalidate_inode_attr(dir); 621 } 622 return retval; 623 } 624 625 /** 626 * v9fs_create - Create a file 627 * @v9ses: session information 628 * @dir: directory that dentry is being created in 629 * @dentry: dentry that is being created 630 * @extension: 9p2000.u extension string to support devices, etc. 631 * @perm: create permissions 632 * @mode: open mode 633 * 634 */ 635 static struct p9_fid * 636 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 637 struct dentry *dentry, char *extension, u32 perm, u8 mode) 638 { 639 int err; 640 char *name; 641 struct p9_fid *dfid, *ofid, *fid; 642 struct inode *inode; 643 644 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 645 646 err = 0; 647 ofid = NULL; 648 fid = NULL; 649 name = (char *) dentry->d_name.name; 650 dfid = v9fs_fid_lookup(dentry->d_parent); 651 if (IS_ERR(dfid)) { 652 err = PTR_ERR(dfid); 653 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 654 return ERR_PTR(err); 655 } 656 657 /* clone a fid to use for creation */ 658 ofid = p9_client_walk(dfid, 0, NULL, 1); 659 if (IS_ERR(ofid)) { 660 err = PTR_ERR(ofid); 661 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 662 return ERR_PTR(err); 663 } 664 665 err = p9_client_fcreate(ofid, name, perm, mode, extension); 666 if (err < 0) { 667 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 668 goto error; 669 } 670 671 if (!(perm & P9_DMLINK)) { 672 /* now walk from the parent so we can get unopened fid */ 673 fid = p9_client_walk(dfid, 1, &name, 1); 674 if (IS_ERR(fid)) { 675 err = PTR_ERR(fid); 676 p9_debug(P9_DEBUG_VFS, 677 "p9_client_walk failed %d\n", err); 678 fid = NULL; 679 goto error; 680 } 681 /* 682 * instantiate inode and assign the unopened fid to the dentry 683 */ 684 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 685 if (IS_ERR(inode)) { 686 err = PTR_ERR(inode); 687 p9_debug(P9_DEBUG_VFS, 688 "inode creation failed %d\n", err); 689 goto error; 690 } 691 v9fs_fid_add(dentry, fid); 692 d_instantiate(dentry, inode); 693 } 694 return ofid; 695 error: 696 if (ofid) 697 p9_client_clunk(ofid); 698 699 if (fid) 700 p9_client_clunk(fid); 701 702 return ERR_PTR(err); 703 } 704 705 /** 706 * v9fs_vfs_create - VFS hook to create a regular file 707 * 708 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 709 * for mknod(2). 710 * 711 * @dir: directory inode that is being created 712 * @dentry: dentry that is being deleted 713 * @mode: create permissions 714 * 715 */ 716 717 static int 718 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 719 bool excl) 720 { 721 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 722 u32 perm = unixmode2p9mode(v9ses, mode); 723 struct p9_fid *fid; 724 725 /* P9_OEXCL? */ 726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 727 if (IS_ERR(fid)) 728 return PTR_ERR(fid); 729 730 v9fs_invalidate_inode_attr(dir); 731 p9_client_clunk(fid); 732 733 return 0; 734 } 735 736 /** 737 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 738 * @dir: inode that is being unlinked 739 * @dentry: dentry that is being unlinked 740 * @mode: mode for new directory 741 * 742 */ 743 744 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 745 { 746 int err; 747 u32 perm; 748 struct p9_fid *fid; 749 struct v9fs_session_info *v9ses; 750 751 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 752 err = 0; 753 v9ses = v9fs_inode2v9ses(dir); 754 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 755 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 756 if (IS_ERR(fid)) { 757 err = PTR_ERR(fid); 758 fid = NULL; 759 } else { 760 inc_nlink(dir); 761 v9fs_invalidate_inode_attr(dir); 762 } 763 764 if (fid) 765 p9_client_clunk(fid); 766 767 return err; 768 } 769 770 /** 771 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 772 * @dir: inode that is being walked from 773 * @dentry: dentry that is being walked to? 774 * @nameidata: path data 775 * 776 */ 777 778 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 779 unsigned int flags) 780 { 781 struct dentry *res; 782 struct super_block *sb; 783 struct v9fs_session_info *v9ses; 784 struct p9_fid *dfid, *fid; 785 struct inode *inode; 786 char *name; 787 788 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n", 789 dir, dentry->d_name.name, dentry, flags); 790 791 if (dentry->d_name.len > NAME_MAX) 792 return ERR_PTR(-ENAMETOOLONG); 793 794 sb = dir->i_sb; 795 v9ses = v9fs_inode2v9ses(dir); 796 /* We can walk d_parent because we hold the dir->i_mutex */ 797 dfid = v9fs_fid_lookup(dentry->d_parent); 798 if (IS_ERR(dfid)) 799 return ERR_CAST(dfid); 800 801 name = (char *) dentry->d_name.name; 802 fid = p9_client_walk(dfid, 1, &name, 1); 803 if (IS_ERR(fid)) { 804 if (fid == ERR_PTR(-ENOENT)) { 805 d_add(dentry, NULL); 806 return NULL; 807 } 808 return ERR_CAST(fid); 809 } 810 /* 811 * Make sure we don't use a wrong inode due to parallel 812 * unlink. For cached mode create calls request for new 813 * inode. But with cache disabled, lookup should do this. 814 */ 815 if (v9ses->cache) 816 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 817 else 818 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 819 if (IS_ERR(inode)) { 820 p9_client_clunk(fid); 821 return ERR_CAST(inode); 822 } 823 /* 824 * If we had a rename on the server and a parallel lookup 825 * for the new name, then make sure we instantiate with 826 * the new name. ie look up for a/b, while on server somebody 827 * moved b under k and client parallely did a lookup for 828 * k/b. 829 */ 830 res = d_materialise_unique(dentry, inode); 831 if (!res) 832 v9fs_fid_add(dentry, fid); 833 else if (!IS_ERR(res)) 834 v9fs_fid_add(res, fid); 835 else 836 p9_client_clunk(fid); 837 return res; 838 } 839 840 static int 841 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 842 struct file *file, unsigned flags, umode_t mode, 843 int *opened) 844 { 845 int err; 846 u32 perm; 847 struct v9fs_inode *v9inode; 848 struct v9fs_session_info *v9ses; 849 struct p9_fid *fid, *inode_fid; 850 struct dentry *res = NULL; 851 852 if (d_unhashed(dentry)) { 853 res = v9fs_vfs_lookup(dir, dentry, 0); 854 if (IS_ERR(res)) 855 return PTR_ERR(res); 856 857 if (res) 858 dentry = res; 859 } 860 861 /* Only creates */ 862 if (!(flags & O_CREAT) || dentry->d_inode) 863 return finish_no_open(file, res); 864 865 err = 0; 866 fid = NULL; 867 v9ses = v9fs_inode2v9ses(dir); 868 perm = unixmode2p9mode(v9ses, mode); 869 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 870 v9fs_uflags2omode(flags, 871 v9fs_proto_dotu(v9ses))); 872 if (IS_ERR(fid)) { 873 err = PTR_ERR(fid); 874 fid = NULL; 875 goto error; 876 } 877 878 v9fs_invalidate_inode_attr(dir); 879 v9inode = V9FS_I(dentry->d_inode); 880 mutex_lock(&v9inode->v_mutex); 881 if (v9ses->cache && !v9inode->writeback_fid && 882 ((flags & O_ACCMODE) != O_RDONLY)) { 883 /* 884 * clone a fid and add it to writeback_fid 885 * we do it during open time instead of 886 * page dirty time via write_begin/page_mkwrite 887 * because we want write after unlink usecase 888 * to work. 889 */ 890 inode_fid = v9fs_writeback_fid(dentry); 891 if (IS_ERR(inode_fid)) { 892 err = PTR_ERR(inode_fid); 893 mutex_unlock(&v9inode->v_mutex); 894 goto error; 895 } 896 v9inode->writeback_fid = (void *) inode_fid; 897 } 898 mutex_unlock(&v9inode->v_mutex); 899 err = finish_open(file, dentry, generic_file_open, opened); 900 if (err) 901 goto error; 902 903 file->private_data = fid; 904 if (v9ses->cache) 905 v9fs_cache_inode_set_cookie(dentry->d_inode, file); 906 907 *opened |= FILE_CREATED; 908 out: 909 dput(res); 910 return err; 911 912 error: 913 if (fid) 914 p9_client_clunk(fid); 915 goto out; 916 } 917 918 /** 919 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 920 * @i: inode that is being unlinked 921 * @d: dentry that is being unlinked 922 * 923 */ 924 925 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 926 { 927 return v9fs_remove(i, d, 0); 928 } 929 930 /** 931 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 932 * @i: inode that is being unlinked 933 * @d: dentry that is being unlinked 934 * 935 */ 936 937 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 938 { 939 return v9fs_remove(i, d, AT_REMOVEDIR); 940 } 941 942 /** 943 * v9fs_vfs_rename - VFS hook to rename an inode 944 * @old_dir: old dir inode 945 * @old_dentry: old dentry 946 * @new_dir: new dir inode 947 * @new_dentry: new dentry 948 * 949 */ 950 951 int 952 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 953 struct inode *new_dir, struct dentry *new_dentry) 954 { 955 int retval; 956 struct inode *old_inode; 957 struct inode *new_inode; 958 struct v9fs_session_info *v9ses; 959 struct p9_fid *oldfid; 960 struct p9_fid *olddirfid; 961 struct p9_fid *newdirfid; 962 struct p9_wstat wstat; 963 964 p9_debug(P9_DEBUG_VFS, "\n"); 965 retval = 0; 966 old_inode = old_dentry->d_inode; 967 new_inode = new_dentry->d_inode; 968 v9ses = v9fs_inode2v9ses(old_inode); 969 oldfid = v9fs_fid_lookup(old_dentry); 970 if (IS_ERR(oldfid)) 971 return PTR_ERR(oldfid); 972 973 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 974 if (IS_ERR(olddirfid)) { 975 retval = PTR_ERR(olddirfid); 976 goto done; 977 } 978 979 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 980 if (IS_ERR(newdirfid)) { 981 retval = PTR_ERR(newdirfid); 982 goto clunk_olddir; 983 } 984 985 down_write(&v9ses->rename_sem); 986 if (v9fs_proto_dotl(v9ses)) { 987 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 988 newdirfid, new_dentry->d_name.name); 989 if (retval == -EOPNOTSUPP) 990 retval = p9_client_rename(oldfid, newdirfid, 991 new_dentry->d_name.name); 992 if (retval != -EOPNOTSUPP) 993 goto clunk_newdir; 994 } 995 if (old_dentry->d_parent != new_dentry->d_parent) { 996 /* 997 * 9P .u can only handle file rename in the same directory 998 */ 999 1000 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1001 retval = -EXDEV; 1002 goto clunk_newdir; 1003 } 1004 v9fs_blank_wstat(&wstat); 1005 wstat.muid = v9ses->uname; 1006 wstat.name = (char *) new_dentry->d_name.name; 1007 retval = p9_client_wstat(oldfid, &wstat); 1008 1009 clunk_newdir: 1010 if (!retval) { 1011 if (new_inode) { 1012 if (S_ISDIR(new_inode->i_mode)) 1013 clear_nlink(new_inode); 1014 else 1015 drop_nlink(new_inode); 1016 } 1017 if (S_ISDIR(old_inode->i_mode)) { 1018 if (!new_inode) 1019 inc_nlink(new_dir); 1020 drop_nlink(old_dir); 1021 } 1022 v9fs_invalidate_inode_attr(old_inode); 1023 v9fs_invalidate_inode_attr(old_dir); 1024 v9fs_invalidate_inode_attr(new_dir); 1025 1026 /* successful rename */ 1027 d_move(old_dentry, new_dentry); 1028 } 1029 up_write(&v9ses->rename_sem); 1030 p9_client_clunk(newdirfid); 1031 1032 clunk_olddir: 1033 p9_client_clunk(olddirfid); 1034 1035 done: 1036 return retval; 1037 } 1038 1039 /** 1040 * v9fs_vfs_getattr - retrieve file metadata 1041 * @mnt: mount information 1042 * @dentry: file to get attributes on 1043 * @stat: metadata structure to populate 1044 * 1045 */ 1046 1047 static int 1048 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1049 struct kstat *stat) 1050 { 1051 struct v9fs_session_info *v9ses; 1052 struct p9_fid *fid; 1053 struct p9_wstat *st; 1054 1055 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1056 v9ses = v9fs_dentry2v9ses(dentry); 1057 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1058 generic_fillattr(dentry->d_inode, stat); 1059 return 0; 1060 } 1061 fid = v9fs_fid_lookup(dentry); 1062 if (IS_ERR(fid)) 1063 return PTR_ERR(fid); 1064 1065 st = p9_client_stat(fid); 1066 if (IS_ERR(st)) 1067 return PTR_ERR(st); 1068 1069 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 1070 generic_fillattr(dentry->d_inode, stat); 1071 1072 p9stat_free(st); 1073 kfree(st); 1074 return 0; 1075 } 1076 1077 /** 1078 * v9fs_vfs_setattr - set file metadata 1079 * @dentry: file whose metadata to set 1080 * @iattr: metadata assignment structure 1081 * 1082 */ 1083 1084 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1085 { 1086 int retval; 1087 struct v9fs_session_info *v9ses; 1088 struct p9_fid *fid; 1089 struct p9_wstat wstat; 1090 1091 p9_debug(P9_DEBUG_VFS, "\n"); 1092 retval = inode_change_ok(dentry->d_inode, iattr); 1093 if (retval) 1094 return retval; 1095 1096 retval = -EPERM; 1097 v9ses = v9fs_dentry2v9ses(dentry); 1098 fid = v9fs_fid_lookup(dentry); 1099 if(IS_ERR(fid)) 1100 return PTR_ERR(fid); 1101 1102 v9fs_blank_wstat(&wstat); 1103 if (iattr->ia_valid & ATTR_MODE) 1104 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1105 1106 if (iattr->ia_valid & ATTR_MTIME) 1107 wstat.mtime = iattr->ia_mtime.tv_sec; 1108 1109 if (iattr->ia_valid & ATTR_ATIME) 1110 wstat.atime = iattr->ia_atime.tv_sec; 1111 1112 if (iattr->ia_valid & ATTR_SIZE) 1113 wstat.length = iattr->ia_size; 1114 1115 if (v9fs_proto_dotu(v9ses)) { 1116 if (iattr->ia_valid & ATTR_UID) 1117 wstat.n_uid = iattr->ia_uid; 1118 1119 if (iattr->ia_valid & ATTR_GID) 1120 wstat.n_gid = iattr->ia_gid; 1121 } 1122 1123 /* Write all dirty data */ 1124 if (S_ISREG(dentry->d_inode->i_mode)) 1125 filemap_write_and_wait(dentry->d_inode->i_mapping); 1126 1127 retval = p9_client_wstat(fid, &wstat); 1128 if (retval < 0) 1129 return retval; 1130 1131 if ((iattr->ia_valid & ATTR_SIZE) && 1132 iattr->ia_size != i_size_read(dentry->d_inode)) 1133 truncate_setsize(dentry->d_inode, iattr->ia_size); 1134 1135 v9fs_invalidate_inode_attr(dentry->d_inode); 1136 1137 setattr_copy(dentry->d_inode, iattr); 1138 mark_inode_dirty(dentry->d_inode); 1139 return 0; 1140 } 1141 1142 /** 1143 * v9fs_stat2inode - populate an inode structure with mistat info 1144 * @stat: Plan 9 metadata (mistat) structure 1145 * @inode: inode to populate 1146 * @sb: superblock of filesystem 1147 * 1148 */ 1149 1150 void 1151 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1152 struct super_block *sb) 1153 { 1154 umode_t mode; 1155 char ext[32]; 1156 char tag_name[14]; 1157 unsigned int i_nlink; 1158 struct v9fs_session_info *v9ses = sb->s_fs_info; 1159 struct v9fs_inode *v9inode = V9FS_I(inode); 1160 1161 set_nlink(inode, 1); 1162 1163 inode->i_atime.tv_sec = stat->atime; 1164 inode->i_mtime.tv_sec = stat->mtime; 1165 inode->i_ctime.tv_sec = stat->mtime; 1166 1167 inode->i_uid = v9ses->dfltuid; 1168 inode->i_gid = v9ses->dfltgid; 1169 1170 if (v9fs_proto_dotu(v9ses)) { 1171 inode->i_uid = stat->n_uid; 1172 inode->i_gid = stat->n_gid; 1173 } 1174 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1175 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1176 /* 1177 * Hadlink support got added later to 1178 * to the .u extension. So there can be 1179 * server out there that doesn't support 1180 * this even with .u extension. So check 1181 * for non NULL stat->extension 1182 */ 1183 strlcpy(ext, stat->extension, sizeof(ext)); 1184 /* HARDLINKCOUNT %u */ 1185 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1186 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1187 set_nlink(inode, i_nlink); 1188 } 1189 } 1190 mode = p9mode2perm(v9ses, stat); 1191 mode |= inode->i_mode & ~S_IALLUGO; 1192 inode->i_mode = mode; 1193 i_size_write(inode, stat->length); 1194 1195 /* not real number of blocks, but 512 byte ones ... */ 1196 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1197 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1198 } 1199 1200 /** 1201 * v9fs_qid2ino - convert qid into inode number 1202 * @qid: qid to hash 1203 * 1204 * BUG: potential for inode number collisions? 1205 */ 1206 1207 ino_t v9fs_qid2ino(struct p9_qid *qid) 1208 { 1209 u64 path = qid->path + 2; 1210 ino_t i = 0; 1211 1212 if (sizeof(ino_t) == sizeof(path)) 1213 memcpy(&i, &path, sizeof(ino_t)); 1214 else 1215 i = (ino_t) (path ^ (path >> 32)); 1216 1217 return i; 1218 } 1219 1220 /** 1221 * v9fs_readlink - read a symlink's location (internal version) 1222 * @dentry: dentry for symlink 1223 * @buffer: buffer to load symlink location into 1224 * @buflen: length of buffer 1225 * 1226 */ 1227 1228 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1229 { 1230 int retval; 1231 1232 struct v9fs_session_info *v9ses; 1233 struct p9_fid *fid; 1234 struct p9_wstat *st; 1235 1236 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1237 retval = -EPERM; 1238 v9ses = v9fs_dentry2v9ses(dentry); 1239 fid = v9fs_fid_lookup(dentry); 1240 if (IS_ERR(fid)) 1241 return PTR_ERR(fid); 1242 1243 if (!v9fs_proto_dotu(v9ses)) 1244 return -EBADF; 1245 1246 st = p9_client_stat(fid); 1247 if (IS_ERR(st)) 1248 return PTR_ERR(st); 1249 1250 if (!(st->mode & P9_DMSYMLINK)) { 1251 retval = -EINVAL; 1252 goto done; 1253 } 1254 1255 /* copy extension buffer into buffer */ 1256 retval = min(strlen(st->extension)+1, (size_t)buflen); 1257 memcpy(buffer, st->extension, retval); 1258 1259 p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n", 1260 dentry->d_name.name, st->extension, buflen, buffer); 1261 1262 done: 1263 p9stat_free(st); 1264 kfree(st); 1265 return retval; 1266 } 1267 1268 /** 1269 * v9fs_vfs_follow_link - follow a symlink path 1270 * @dentry: dentry for symlink 1271 * @nd: nameidata 1272 * 1273 */ 1274 1275 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1276 { 1277 int len = 0; 1278 char *link = __getname(); 1279 1280 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 1281 1282 if (!link) 1283 link = ERR_PTR(-ENOMEM); 1284 else { 1285 len = v9fs_readlink(dentry, link, PATH_MAX); 1286 1287 if (len < 0) { 1288 __putname(link); 1289 link = ERR_PTR(len); 1290 } else 1291 link[min(len, PATH_MAX-1)] = 0; 1292 } 1293 nd_set_link(nd, link); 1294 1295 return NULL; 1296 } 1297 1298 /** 1299 * v9fs_vfs_put_link - release a symlink path 1300 * @dentry: dentry for symlink 1301 * @nd: nameidata 1302 * @p: unused 1303 * 1304 */ 1305 1306 void 1307 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1308 { 1309 char *s = nd_get_link(nd); 1310 1311 p9_debug(P9_DEBUG_VFS, " %s %s\n", 1312 dentry->d_name.name, IS_ERR(s) ? "<error>" : s); 1313 if (!IS_ERR(s)) 1314 __putname(s); 1315 } 1316 1317 /** 1318 * v9fs_vfs_mkspecial - create a special file 1319 * @dir: inode to create special file in 1320 * @dentry: dentry to create 1321 * @mode: mode to create special file 1322 * @extension: 9p2000.u format extension string representing special file 1323 * 1324 */ 1325 1326 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1327 u32 perm, const char *extension) 1328 { 1329 struct p9_fid *fid; 1330 struct v9fs_session_info *v9ses; 1331 1332 v9ses = v9fs_inode2v9ses(dir); 1333 if (!v9fs_proto_dotu(v9ses)) { 1334 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1335 return -EPERM; 1336 } 1337 1338 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1339 P9_OREAD); 1340 if (IS_ERR(fid)) 1341 return PTR_ERR(fid); 1342 1343 v9fs_invalidate_inode_attr(dir); 1344 p9_client_clunk(fid); 1345 return 0; 1346 } 1347 1348 /** 1349 * v9fs_vfs_symlink - helper function to create symlinks 1350 * @dir: directory inode containing symlink 1351 * @dentry: dentry for symlink 1352 * @symname: symlink data 1353 * 1354 * See Also: 9P2000.u RFC for more information 1355 * 1356 */ 1357 1358 static int 1359 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1360 { 1361 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1362 dir->i_ino, dentry->d_name.name, symname); 1363 1364 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1365 } 1366 1367 /** 1368 * v9fs_vfs_link - create a hardlink 1369 * @old_dentry: dentry for file to link to 1370 * @dir: inode destination for new link 1371 * @dentry: dentry for link 1372 * 1373 */ 1374 1375 static int 1376 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1377 struct dentry *dentry) 1378 { 1379 int retval; 1380 char *name; 1381 struct p9_fid *oldfid; 1382 1383 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1384 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); 1385 1386 oldfid = v9fs_fid_clone(old_dentry); 1387 if (IS_ERR(oldfid)) 1388 return PTR_ERR(oldfid); 1389 1390 name = __getname(); 1391 if (unlikely(!name)) { 1392 retval = -ENOMEM; 1393 goto clunk_fid; 1394 } 1395 1396 sprintf(name, "%d\n", oldfid->fid); 1397 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1398 __putname(name); 1399 if (!retval) { 1400 v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1401 v9fs_invalidate_inode_attr(dir); 1402 } 1403 clunk_fid: 1404 p9_client_clunk(oldfid); 1405 return retval; 1406 } 1407 1408 /** 1409 * v9fs_vfs_mknod - create a special file 1410 * @dir: inode destination for new link 1411 * @dentry: dentry for file 1412 * @mode: mode for creation 1413 * @rdev: device associated with special file 1414 * 1415 */ 1416 1417 static int 1418 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1419 { 1420 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1421 int retval; 1422 char *name; 1423 u32 perm; 1424 1425 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 1426 dir->i_ino, dentry->d_name.name, mode, 1427 MAJOR(rdev), MINOR(rdev)); 1428 1429 if (!new_valid_dev(rdev)) 1430 return -EINVAL; 1431 1432 name = __getname(); 1433 if (!name) 1434 return -ENOMEM; 1435 /* build extension */ 1436 if (S_ISBLK(mode)) 1437 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1438 else if (S_ISCHR(mode)) 1439 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1440 else if (S_ISFIFO(mode)) 1441 *name = 0; 1442 else if (S_ISSOCK(mode)) 1443 *name = 0; 1444 else { 1445 __putname(name); 1446 return -EINVAL; 1447 } 1448 1449 perm = unixmode2p9mode(v9ses, mode); 1450 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1451 __putname(name); 1452 1453 return retval; 1454 } 1455 1456 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1457 { 1458 int umode; 1459 dev_t rdev; 1460 loff_t i_size; 1461 struct p9_wstat *st; 1462 struct v9fs_session_info *v9ses; 1463 1464 v9ses = v9fs_inode2v9ses(inode); 1465 st = p9_client_stat(fid); 1466 if (IS_ERR(st)) 1467 return PTR_ERR(st); 1468 /* 1469 * Don't update inode if the file type is different 1470 */ 1471 umode = p9mode2unixmode(v9ses, st, &rdev); 1472 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1473 goto out; 1474 1475 spin_lock(&inode->i_lock); 1476 /* 1477 * We don't want to refresh inode->i_size, 1478 * because we may have cached data 1479 */ 1480 i_size = inode->i_size; 1481 v9fs_stat2inode(st, inode, inode->i_sb); 1482 if (v9ses->cache) 1483 inode->i_size = i_size; 1484 spin_unlock(&inode->i_lock); 1485 out: 1486 p9stat_free(st); 1487 kfree(st); 1488 return 0; 1489 } 1490 1491 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1492 .create = v9fs_vfs_create, 1493 .lookup = v9fs_vfs_lookup, 1494 .atomic_open = v9fs_vfs_atomic_open, 1495 .symlink = v9fs_vfs_symlink, 1496 .link = v9fs_vfs_link, 1497 .unlink = v9fs_vfs_unlink, 1498 .mkdir = v9fs_vfs_mkdir, 1499 .rmdir = v9fs_vfs_rmdir, 1500 .mknod = v9fs_vfs_mknod, 1501 .rename = v9fs_vfs_rename, 1502 .getattr = v9fs_vfs_getattr, 1503 .setattr = v9fs_vfs_setattr, 1504 }; 1505 1506 static const struct inode_operations v9fs_dir_inode_operations = { 1507 .create = v9fs_vfs_create, 1508 .lookup = v9fs_vfs_lookup, 1509 .atomic_open = v9fs_vfs_atomic_open, 1510 .unlink = v9fs_vfs_unlink, 1511 .mkdir = v9fs_vfs_mkdir, 1512 .rmdir = v9fs_vfs_rmdir, 1513 .mknod = v9fs_vfs_mknod, 1514 .rename = v9fs_vfs_rename, 1515 .getattr = v9fs_vfs_getattr, 1516 .setattr = v9fs_vfs_setattr, 1517 }; 1518 1519 static const struct inode_operations v9fs_file_inode_operations = { 1520 .getattr = v9fs_vfs_getattr, 1521 .setattr = v9fs_vfs_setattr, 1522 }; 1523 1524 static const struct inode_operations v9fs_symlink_inode_operations = { 1525 .readlink = generic_readlink, 1526 .follow_link = v9fs_vfs_follow_link, 1527 .put_link = v9fs_vfs_put_link, 1528 .getattr = v9fs_vfs_getattr, 1529 .setattr = v9fs_vfs_setattr, 1530 }; 1531 1532